#### Solve cubic equation

## Is there a cubic formula?

A cubic equation is an equation which can be represented in the form a x 3 + b x 2 + c x + d = 0 ax^3+bx^2+cx+d=0 ax3+bx2+cx+d=0, where a , b , c , d a,b,c,d a,b,c,d are complex numbers and a is non-zero.

## What are the roots of a cubic equation?

Cubic equationIn algebra, a cubic equation in one variable is an equation of the form.The solutions of this equation are called roots of the cubic function defined by the left-hand side of the equation. The coefficients do not need to be real numbers.

## How do you simplify a cubic equation?

Find one factor that causes the polynomial to equal to zero.Start by using your first factor, 1. Substitute “1” for each “x” in the equation: (1)^{3} – 4(1)^{2} – 7(1) + 10 = 0.This gives you: 1 – 4 – 7 + 10 = 0.Because 0 = 0 is a true statement, you know that x = 1 is a solution.

## How do I solve a cubic equation in Excel?

The procedure is:Rearrange the equation to the form: aX^3 + bX^2 + cX + d = 0. Enter the coefficients, a to d, in a single column or row:Enter the cubic function, with the range of coefficient values as the argument.This will return one of the three solutions to the cubic equation.

## How do you know if a cubic equation has real roots?

The roots are both real if and only if b2>c. In addition, both roots are positive if and only if b>0 and b>√b2−c (which implies c>0). Therefore we have two positive roots if and only if b>0 and b2>c>0, as before.

## How do you find the equation of a cubic function with 4 points?

the general cubic equation is y=ax3+bx2+cx+d. Plug in the coordinates of the points for x and y, and you end up with a system of four equations in four variables, namely a,b,c and d. Hope that helps! so that f1(x1)=1 and f1(xi)=0,i≠1, and similarly f2,f3,f4.

## What does a cubic equation look like?

A cubic equation is an algebraic equation of third-degree. The general form of a cubic function is: f (x) = ax^{3} + bx^{2} + cx^{1} + d. And the cubic equation has the form of ax^{3} + bx^{2} + cx + d = 0, where a, b and c are the coefficients and d is the constant.